quasar | 154f3bb6d0872d339a2625f7a2cf0dc4f96d85aa94d4f76c4c76f3d81a37d19d

General

Target

Client-built.exe
Size

3.1MB
MD5

f2d7f59c276231747caccd70bf574f01
SHA1

7a94a716a5726d10e5559fa614e6bb6e87e26aa1
SHA256

154f3bb6d0872d339a2625f7a2cf0dc4f96d85aa94d4f76c4c76f3d81a37d19d
SHA512

c8d635d95b796c2f480659429e34530e660e7dab67b3f99788508540972294731963129919967a25ba49d664034c341030309a7cb4c7fc00ffd01504e25abc46
SSDEEP

49152:/ZGG1LyJ9qP/u0F+F1nqJ3F9j9F7w49WoAVBTHHB72eh2NT:/ZG/Jw20F+F1nqJ3F9T7wn

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.0.0

Botnet

Office04

C2

Name123forreal-22013.portmap.host:22013

Mutex

f9634259-eba6-40ac-8644-2c8e433257e9

Attributes

encryption_key
5FD1DA98B24B21C2214C328FD3F0A48F15BBCD2B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Window Defender Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/3304-1-0x0000000000190000-0x00000000004B4000-memory.dmp	family_quasar
behavioral1/files/0x000300000002aabb-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2872	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1287768749-810021449-2672985988-1000_Classes\Local Settings\MuiCache	MiniSearchHost.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
332	schtasks.exe
4452	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3304	Client-built.exe
Token: SeDebugPrivilege	2872	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2872	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2872	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3876	MiniSearchHost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3304 wrote to memory of 332	3304	Client-built.exe	79
PID 3304 wrote to memory of 332	3304	Client-built.exe	79
PID 3304 wrote to memory of 2872	3304	Client-built.exe	81
PID 3304 wrote to memory of 2872	3304	Client-built.exe	81
PID 2872 wrote to memory of 4452	2872	Client.exe	82
PID 2872 wrote to memory of 4452	2872	Client.exe	82

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3304
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Window Defender Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:332
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2872
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Window Defender Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4452

C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe
"C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:3876

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat

Filesize
10KB

MD5
a73ea6e1db27acedbe4055c448f82ef7

SHA1
01769a266d26c4b4b374099606e86b8874ddd55f

SHA256
c3059c62596021e555ec7901361fcde75078ad931bcac6027539930bef8b77d9

SHA512
f9cfe99077e40ac3ff11ab39020d6e159ec06cf50f9b1d156858198d48851d29de8882a18609a17dd30ddea421c6c415683b8d7b14fa30a51ddd1cd76032deb4

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
f2d7f59c276231747caccd70bf574f01

SHA1
7a94a716a5726d10e5559fa614e6bb6e87e26aa1

SHA256
154f3bb6d0872d339a2625f7a2cf0dc4f96d85aa94d4f76c4c76f3d81a37d19d

SHA512
c8d635d95b796c2f480659429e34530e660e7dab67b3f99788508540972294731963129919967a25ba49d664034c341030309a7cb4c7fc00ffd01504e25abc46

Download Submit
memory/2872-10-0x00007FF905F90000-0x00007FF906A52000-memory.dmp

Filesize
10.8MB

Download
memory/2872-11-0x00007FF905F90000-0x00007FF906A52000-memory.dmp

Filesize
10.8MB

Download
memory/2872-12-0x000000001CC60000-0x000000001CCB0000-memory.dmp

Filesize
320KB

Download
memory/2872-13-0x000000001CD70000-0x000000001CE22000-memory.dmp

Filesize
712KB

Download
memory/2872-14-0x00007FF905F90000-0x00007FF906A52000-memory.dmp

Filesize
10.8MB

Download
memory/3304-0-0x00007FF905F93000-0x00007FF905F95000-memory.dmp

Filesize
8KB

Download
memory/3304-1-0x0000000000190000-0x00000000004B4000-memory.dmp

Filesize
3.1MB

Download
memory/3304-2-0x00007FF905F90000-0x00007FF906A52000-memory.dmp

Filesize
10.8MB

Download
memory/3304-9-0x00007FF905F90000-0x00007FF906A52000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads